Carburetor for internal-combustion engines



W. H. ANDERSON. "CAR8URETOR FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 6, I9 20. 1,41 5,423. Patented May 9, 1922.

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EEAndarw Aka-a my w. H. ANDERSON. CARBURETOR FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED MAY 6. 1920.

1, 11 5,423. Patented my 9,1922.

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'w. H. ANDERSON.

'CABBUBTOR FOR INTERNAL COMBUSTION ENGINES. APPLICATION men MAY'S. 1920.

1,415,423. Patented may 9,1922.

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JNVENIUR HHAnd ensm ATTORNEY wnn'rnnjfnrnnrnn'nnnnnsojn', or LONDON, NGLA D,

To all whom it may concern:

DERSON, a subject of the King 'of Great Brit-f House, Phoenix Street, .London, N. 1,

England, have invented certain new-and useful Improvements inCarburetors for Internal-Combustion Engines, of which the following is a specification. V 1 This invention relates to carburetors of the jetor spray type, such as are used on motor cars, aeroplanes and the like, and has more'particular reference to lmprovements in thearrangement of the supply of fuel for. variabledemands. 1 I

The object. of the invention is to provide a carburetor which is easily adjusted for supplying petrol .or thelike' liquidjfuel in proportion to the demand for power: :and

which comprises improved means for'providing the diminished supply necessary for:

keeping the engine working slowly on light load.

The invention consists primarily 'in a novel form of multiple jet carburetor in which a'separate initial or primary air supply is provided for each ofthe fuel ets and which air supplies are separately. regulatable.

In order to carry into effect the present invention, two constructions of the carburetor are illustrated in the accompanying t I which leadto the et passages and 61.

drawingsjin which Figure 1 shows a construction of a carburetor in sectional elevat on having two'fuel supplies.

mary air filter and regulator.

Figure 2 is a plan of the carburetor shown in Fig.1.

fied form of carburetor with three main jets. Figure 4c isaplan of the-same. I Figure 5 is a sectional elevation of an induction tube showing the, conical valve linked to abutterfiy valve.

A construction'ofthe improved carburetor is shown in Figures 1 and 2, in which the supplementary and main et passages are arranged in parallel axes. The, main'casting comprises the induction pipe and the'float chamber 51. Within the said casting is fitted the central nozzlecarrying member 52 secured centrally in position by nut '53 being located by screw 53*. The member 52 has Be it known that .I,-WALTnRl'I1LLmn i-hN-a Figure 3 isa sectional elevation of a modi- CARBURETOR roe rirrnnnnn-oorrnusrron enemas.

which is screwed nozzle 55 having a choke nozzle 56, for thepassage of the initial fuel- Patented. M o, 1922. p Application filed May 6, 1929. seriaino. 379,363.

mixture which supplies the' engine when running slowly on light load.-- Betweenthe head of thesaid nozzle and the member 52 is a conoidal distance piece 56 for thepur-' pose of giving a-stream line effect at the top of choke tube 57. This constructionavoids the formation of eddies. Jet tubes 58 and 59 are screwedone into eachof the two jet passagesj60and'61' so that the nozzles are I situated just below the normal level of the petrol in the "float chamber. Passages 62 and 63 are drilled transversely into the member 52 communicating respectively with the topscf jet passages .60 and 61, ending in sloping channels 6% and 65. Passage 62 is extended into the central hole 54. Each of the fuel jets is provided with a separate pri-- mary or initial air supply regulator one of which is indicated by 7 2 (Figure 2) and in detail in Figurelfi. The initial air is filtered in passing through the gauze wire 71 and the quantity is regulated by the regulator head 72 which can be rotated so that the. transverse holes therein register. more or less with similar holes in the upper part of the passage 73 which extends downwardly in the main casting 51. I

Passages 73 and 7 lconnect respectively with the transverse passages 75 and 76- When supplying explosive mixture for runn ng. the englne on light load, fuel flows I from the main supply tank through: passage Figure 1 is a detail of the initial or pri- 66 passing thence through the gauze filter 67; and the several holes 68 andenters the float chamber past needle, valve 69. From the float chamber the fuel enters chamber 7 G and thence into jet tube 58. Initial air drawn through the regulator 72 by the suction of the engine, passes along passages 7 3, 75 into 60 thence through the small holes 77 into'tube 78 carrying with it atomized fuel, to .the central hole 54 and nozzle 55.

IThe size of choke passage 56 is determined 'bythe lever mechanism 81 to. 85. which .is-

actuated by .a foot accelerator or by any other suitable means. ,As shown the valve entirely shuts off the sloping passages 6-1 and 05 when the valve 18 in the closed position.

- ized fuel to be drawn from jet nozzle 58,

while an increased supply of main air can pass into the choke tube 57. When the top of valve 80 is lowered towards the center of passage 62 the sloping passage 65 is brought into action, permitting a further graduated supply of atomized fuel to be drawn from jet nozzle 59. The supply of mixture is graduated until the top of valve passes the centre of passage 63. During this clownward movement of valve 30 the supply of main air is also gradually increased until the top of the valve passes below the seating 88. The result of this simultaneous control of the supply of fuel mixture and main air by the operation of the main valve, is that a definite proportion of explosive mixture is obtained for varying demands. a

It will thus be seen that the quantity of initial or primary air for atomizing the liquid fuel, when the engine is running on load is determined by the separate adjustment of the air regulators 72.

The supply of fuel to suit any particular engine is first roughly regulated by varying the sizes of the jet nozzles 58 and 59 and is more accurately adjusted by means of the separate air regulators 72.

By allowing a free supply of air to pass through the passages from the air regulators 72 to the small holes 77 the suction on the petrol jets is reduced, thereby a lean mixture is obtained, while to obtain a richer mixture the amount of air is reduced .by closing down the apertures at the top of passages 73 and 71 by means of the regulator 72.

In the modification shown at Figures 3 and 4:, there are three jet tubes 101, 103 and 105, to each of which the primary or initial air is supplied by a separate air filter and regulator seen at 102, 10 1 and 106. Lug 121 is provided on the main casting 51 for a fourth primary air inlet. The central nozzle through which the fuel supply passes to the engine when running at light load is seen at 107. The passage 108 to this nozzle is connected to the jet passage which first opens into th choke passage 109 when the cone valve 110 is lowered from its seating 111. As in the previous construction the three sloping passages, one of which 13 shown at 112, are arranged to open in succession until the maximum fuel supply and the maximum main air supplythrough opening 113 passes to the induction tube.

The arrangement of the parts provides for easy access for assembling or repairs. The three jet tubes 101, 103 and 105 are separately screwed into the jet tube carrier 11 1 from its lower end. The said carrier is held in position by nut 115. A passage 116 communicates between the float chamber and the chamber 117 below the jet tubes, formed in the liquid tight nut 118. I

The air passages from the primary air regulators communicate with clearance spaces surrounding the jet tubes. One of these passages 119 is seen in section in Figure 5, the path of the air being thence into chamber 120 just above the fuel nozzle, the mixture passing through sloping channel 112 into choke passage 109 when the cone valve 110 is sufficiently lowered.

The arrangement of primary air and fuel passages is similar to that described in connection with Figs. 1 and 2. Each of the air regulators 102, 104 and 106 is fitted at the top of a separate air passage (as 73 and Tel of Fig. 1), and these communicate respectively with the jet tubes 101, 103 and 105 by short horizontal passages, as clearly seen in the plan view Fig. 4. These horizontal passages that lead to tubes 101 and 103 are indirect, but one horizontal passage 119 leads directly to tube 105.

The reciprocation of the cone valve is ef fected by means of trunnion pins, links 122 and crank arms 123 that are pinned to a pivot member 124 actuated by any suitable means.

As the cone valve 110 is lowered from its seating and opens successively the three sloping passages by which the mainfuel supply passes to the induction tube, an'increase in the main air supply through opening 113 is provided around the valve 110 whereby the proper proportion of fuel and air is maintained to give maximum economy in fuel consumption.

The cone valve referred to in the fore going description may be used in conjunction with a butterfly valve in the induction pipe, either independently therefrom or connected therewith by a link or similar means. In Figure 5 is shown an arrangement for a'combined movement in which the main casing 200 is fitted with the jet carrying member 201 upon which is slidable the cone valve 202. The choke tube 203 is extended and forms a chamber 20 1 within which the butterfly valve 205 is pivoted at 206; A link 207 connects with the cone valve and a crank 208 on the pivot shaft of the butterfly valve whereby the twovalves are adapted to open and close together through any usual control medium.

Having now described my invention, what I claim as new and desire to secure byLetover said central member adapted to simultaneously control both the fuel mixture and a main air supply to the mixing chamber.

2. A jetor spray carburetor as claimed in claim 1, in combination with a choke memberv with which the cone valve oo-operates for controlling the supply of main air, and a regulator for each air member for adjusting jets.

, In testimony whereof I have signed my name to this specification.

WALTER HILLIER ANDERSON.

the initial air supply to each of thefuel' I 

